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For a spherical mirror of small aperture, the relation between radius of curvature R and focal length f is:
AR = 4f
BR = f/2
CR = f
DR = 2f
Answer & Solution
Correct answer: D. R = 2f
1. The focal point lies midway between pole and centre of curvature.
2. Hence the radius of curvature is twice the focal length.
3. Symbolically R = 2f.
_Source: NCERT Class 10 Science, Ch 9 "Light Reflection and Refraction", §9.2_
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